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Sommaire du brevet 1164973 

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Disponibilité de l'Abrégé et des Revendications

L'apparition de différences dans le texte et l'image des Revendications et de l'Abrégé dépend du moment auquel le document est publié. Les textes des Revendications et de l'Abrégé sont affichés :

  • lorsque la demande peut être examinée par le public;
  • lorsque le brevet est émis (délivrance).
(12) Brevet: (11) CA 1164973
(21) Numéro de la demande: 1164973
(54) Titre français: FONCTIONNEMENT D'UNE TRANSMISSION DE VEHICULE EN RAISON DU COUPLE MOTEUR
(54) Titre anglais: THRESHOLD OPERATION OF A VEHICLE TRANSMISSION
Statut: Durée expirée - après l'octroi
Données bibliographiques
(51) Classification internationale des brevets (CIB):
  • B60K 31/00 (2006.01)
  • B60K 23/00 (2006.01)
  • E2F 9/22 (2006.01)
  • F16H 61/478 (2010.01)
(72) Inventeurs :
  • FULKERSON, THOMAS R. (Etats-Unis d'Amérique)
  • HAWKINS, ROYAL R. (Etats-Unis d'Amérique)
(73) Titulaires :
(71) Demandeurs :
(74) Agent: SMART & BIGGAR LP
(74) Co-agent:
(45) Délivré: 1984-04-03
(22) Date de dépôt: 1980-09-11
Licence disponible: S.O.
Cédé au domaine public: S.O.
(25) Langue des documents déposés: Anglais

Traité de coopération en matière de brevets (PCT): Non

(30) Données de priorité de la demande:
Numéro de la demande Pays / territoire Date
103,964 (Etats-Unis d'Amérique) 1979-12-17

Abrégés

Abrégé anglais


ABSTRACT
A system for controlling a transmission of a vehi-
cle dependent upon engine output is disclosed having a sen-
sor for sensing the output of the engine of the vehicle, a
controller connected to the sensor for controlling the out-
put of the transmission of the vehicle dependent upon engine
output, and a threshold circuit connected to the controller
for inhibiting transmission output until the engine output
has attained a predetermined level.

Revendications

Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.


THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A system for controlling a transmission of a vehicle dependent upon
engine output, said engine being adapted to be driven in a first speed range
of operation and also to propel said vehicle by said transmission during a
second higher speed range of operation, the transmission having an input
connected to an output of the engine and having an output, the system com-
prising: speed sensing means adapted to sense the output speed of the engine;
control means connected to said sensing means and adapted to control said
transmission output solely dependent upon said engine output; and, thres-
hold means connected to said control means for inhibiting transmission out- `
put in the first range of engine operation until said engine output has
attained a predetermined reference level, and said control means providing
proportional control of said transmission relative solely to said engine
output speed once said engine output has attained the predetermined reference
level.
2. The system of claim 1 wherein said speed sensing means comprises a
pulse pickup unit adapted to be associated with said engine output for
providing an output signal having a frequency dependent upon engine output
speed.
3. The system of claim 2 wherein said sensing means further comprises
a frequency-to-voltage converter for receiving said signal from said pulse
pickup unit and for providing a voltage output dependent upon said frequency.
4. The system of claim 3 wherein said control means comprises an
amplifier having a first input connected to said frequency-to-voltage
converter for receiving said voltage output thereof.
5. The system of claim 4 wherein said threshold means comprises a
reference means connected to a second input of said amplifier.

6. The system of claim 5 wherein said control means further comprises
a forward/reverse circuit connected to an output of said amplifier for
determining the forward and reverse direction of travel for said vehicle.
7. A system for controlling a hydrostatic transmission of a vehicle
solely dependent upon engine speed, said engine being adapted to be driven
in a first speed range of operation and also to propel said vehicle by
said transmission during a second higher speed range of operation, the hydro-
static transmission including a pump connected to an output of the engine
and a hydraulic motor for receiving hydraulic fluid from the pump, the
hydraulic motor having an output, the system comprising: speed sensing
means adapted to sense the speed of the output of said engine; control means
connected to said speed sensing means and adapted to control the flow of
hydraulic fluid from said pump to said hydraulic motor solely dependent upon
engine speed; and, threshold means connected to said control means for
preventing the flow of hydraulic fluid from said pump to said hydraulic
motor in the first range of engine operation until the speed of said engine
output has attained a predetermined reference level, and said control means
providing proportional control of said transmission relative solely to
said engine output speed once said engine output has attained the predeter-
mined reference level.
8. The system of claim 7 wherein said speed sensing means comprises a
pulse pickup unit adapted to provide an output signal having a frequency
dependent upon said engine speed.
9. The system of claim 8 wherein said speed sensing means further com-
prises a frequency-to-voltage converter connected to said pulse pickup
unit for providing a voltage output signal having a voltage dependent upon
said frequency.

10. The system of claim 9 wherein said control means comprises a valve
adapted to control a swash plate of said pump and means connecting said
valve to said frequency-to-voltage converter for controlling said hydraulic
motor output as a function of engine speed.
11. The system of claim 9 wherein said control means comprises an
amplifier having a first input connected to said frequency-to-voltage
converter for receiving said voltage output signal.
12. The system of claim 11 wherein said threshold means comprises
reference means connected to a second input of said amplifier for establis-
hing a threshold level of engine speed above which said hydrostatic trans-
mission is operated and below which said hydrostatic transmission is not
operated.
13. The system of claim 12 wherein said control means further comprises
a forward/reverse circuit connected to an output of said amplifier for
determining the forward and reverse direction of said vehicle.
14. The system of claim 13 wherein said control means further comprises
a valve connected to said forward/reverse circuit and adapted to control
the swash plate of said pump to control the flow of hydraulic fluid from
said pump to said hydraulic motor.
15. The system of claim 7 wherein said control means comprises a valve
adapted to control a swash plate of said pump and means connecting said valve
to said control means for controlling said hydraulic motor output as a fun-
ction of engine speed.
16. The system of claim 5 wherein said control means comprises an
amplifier having a first input connected to said speed sensing means.

17. The system of claim 16 wherein said control means further comprises
a forward/reverse circuit connected to an output of said amplifier for
determining the forward and reverse direction of said vehicle.

Description

Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.


THRESHOLD OPERAT~ON OF A VEHICLE TRANSMISSION
-
BACKGROUND OF TE]E INVENTION
This invention relates to a system for controlling
the operation of a vehicle's ~ransmission a~ a threshold
level of the vehicle's engine outputO More specifically,
the invention relates to a system for delaying the operation
of a vehicle's transmission until the engine output speed
has attained a predetermined level.
Many modern day vehicles are fully capable of
utilizing the vehicle engine for providing both auxiliary
~unctions and vehicle drive. Such vehicles can include, as
examples, aerial lift trucks, grade trimmers, fork lif~s,
dozers, trenchers and front end loaders. In the control of
such vehicles, the operator sets engine speed at a
predetermined governed value for powering all functions of
the machine~ Thus, when the bucket of a front end loader is
to be operated, for example, he levers fo~ controlling the
orientation of the bucket are operated and, when the machine
is to be driven in the forward ox reverse direction, the
forwaxd and reverse drive pedals are opera~ed to in turn
operate ~he transmission of the vehicle~ Such an aperation
means that when the vehicle is standing still and the bucket
is being operated as one of the auxiliary functions of the
vehicle, the vehicle's engine is quite likely supplying
excessive horsepower and, thereforer consuming excessive
fuel.
The present invention instead dr~ves the transmis-
sion of the vehicle as a func~ion of engine speed so that a
range of engine speed is provided for powering the auxiliary
functions of the vehicle before the additional power neces-
sary to drive the vehicle is provided. Thus, the present
invention allows the engine to run fast enough for supplying
_f~ . ~
.

9 ~ 3
the auxiliary functions wi~hout providi.ng transmission output. At higher
engine speeds, the transmission output adapts to engine rpm in a load con-
trol manner; that is, if the engi.ne speed drops because of excess load, the
transmission "downshifts". This "downshift" also occurs as a result of
throttle reduction.
SI~MARY OF: TtIF, INVENTION
These advantages are obtained from the present invention in which
a sensor senses the output of the engine, a controller which is connected
to the sensor controls the transmission output of the vehicle dependent
upon the engine output, and a threshold arrangement is connected to the
controller for preventing transmission output until the engine output has
attained a predetermined level.
More particularly, the present invention provides a system for
controlling a transmission of a vehicle dependent upon engine output, said
engine being adapted to be driven in a first speed range of operation and
also to propel said vehicle by said transmission during a second higher
speed range of operation, the transmission having an input connected to
an output of the engine and having an output, the system comprising: speed
sensing means adapted to sense the output speed of the engine; control
:: 20 means connected to said sensing means and adapted to control said transmis-
sion output solely dependent upon said engine output; and, threshold means
connected to said control means for inhibiting transmission output in the
first range of engine operation until said engine output has attained a
predetermined reference level, and said control means providing propor-
tional control of said transmission relative solely to said engine output
speed once said engine output has attained the predetermined reference
: level.
BRIEF DESCRIPTI ON OF THE DRAWINGS
These and other features and advantages will become apparent :Erom
3Q a detailed consideration of the invention when taken in conj~mction with
the drawings in which:
; 2
.

7 3
Figure l shows one type of machine on which the present system can
be used;
Figure 2 shows the system according to the present invention; and,
Figure 3 is a graph showing swash plate angle of the pump in the
hydrostatic transmission shown in Figure 2 as a function of engine output.
DETAILED DESCRIPTION
In Figure l, front end loader lO comprises bucket ll, operator's
cab 12 and engine 13. Inside operator's cab 12 are the various levers and
pedals for controlling the forward and reverse progress of vehicle lO and
the orientation and work performed by bucket ll. Since vehicle lO is of
ordinary design, the details of it will not be specifi-
~0
~'
-2a-

7 3
cally shown herein. However, the control system for
propelling vehicle lO is shown in detail in Figure 2.
As shown in Figure 2, vehicle lO has its engine 13
controlled by lever 14 (which alternatively may be a foot
pedal3 connected to engine 13 by shaft 15. Lever 14
controls the amount of fuel supplied to engine 13 and
therefore controls the rotational speed of engine output 160
Output 16 is ~hen connected to hydrostatic transmission 20
in the form of hydraulic pump 21 and hydraulic motor 22
interconnected by hydraulic lines 23 and 24. Hydraulic
motor 22 then has an output shaft 25 connected to the drive
train of the vehicle for propulsion.
The system according to the present invention for
providin~ the operation described herein comprises pulse
pickup unit 30 sensing the speed of rotation of disc 31
affixed to engine output 16 and providing a series of output
pulses the frequency of which is dependent upon this speed.
Typically, disc 31 has a plur~lity of teeth which interact
with a magnetic field established by pulse plckup unit 30 to
induce the pulses which are supplied to frequency-to-voltage
converter 32. Pulse pickup unit 30 ma~ be an SBlOOA
manufactured by Honeywell Inc. Frequency~to-voltage conver-
ter 32 converts the frequency of the pulses received from
pulse pickup unit 30 into a voltage proportional to that
frequency and supplies that voltage to the positive input of
amplifier 33~ The output of ampliier 33 is connected
through resistor 34 to one input of summing junction 36.
The function of summing junction 36 and resistor 34 is
connected to ground through diode 35 and resistor 41. The
other input to summing junction 36 is a reference input
which establishes a threshold level below which output shaft
25 of hydros~atic-transmission 20 will not rotate and above~
3 -

which the revolutions per minute of output shaft 25 isgoverned by the output o~ engine 130 The output from
summing junction 36 is connected to the negative input of
amplifier 33~ Frequency-to-voltage converter 32 and ampli~
fier 33 may be a package manufactured by ~oneywell Inc.
under the number W883A. ~esistor 41 and diode 35 are
included in the feedback circuit of amplifier 33 for
characterizing the output of amplifier 33 as will be
discussed with respect to Figure 3.
The output from amplifier 33 is connected through
forward/reverse switch 37 the output of which is then
connected to valve 38. Yalve 38 may be a V7058A
manufactured by Honeywell Inc. and receives the electrical
signal from forward/reverse switch 37 to provide a hydraulic
output for controlling the swash plate of pump 21 and,
therefore~ the output ~hereof. Forward/reverse switch 37
controls the polarity of the signal supplied to valve 38 for
driving vehicle 10 in a forward or a reverse direction.
As described above~ the reference input to summing
juncti~n ~6 provides a threshold level for operation of
hydrostatic transmission 20. Figure 3 is a graph showing
the operation of hydrostatic transmission ~0 as a unction
of engine output rpm~ The idle point is the lowest setting
of engine 13 providing the lowest output 160 As the engine
is throttled upward, output 16 increases and, as a result,
~he pulses from pulse pickup unit 30 increase in frequency.
This increased frequency results in an increased voltage to
the positive input of amplifier 33. However, the output
from amplifier 33 and forward/reverse switch 37 will not
begin to change until the voltage to the positive input of
amplifier 33 exceeds the input to the negative input termi-
nal which is a function of the reference setting. Once this
._ ~

~1 I ti 4 ~ r7 3
reference setting has been attained by the output from
frequency-to-voltage converter 32, the angle of the swash
plate of pump 21 will follow curve A of Figure 3 for the
forward direction and curve B for the reverse direction.
Curves C and D are provided by the resistor 41 and diode 35
circuit to characterize curves A and B.
It can be seen from Figures 2 and 3 that as the
loading on the machine increases, the output 16 of engine 33
reduces which will proportionally reduce the pump swash
plate angle and reduce the speed of rotation of output shaft
25 from hydrostatic transmission ~0 resulting in a
"downshift". If the forward or reverse progress of vehicle
10 is to be maintained, throttle 14 must be increased to
accommodate the increased load up to the point where engine
13 is at its horsepower limit. When vehicle 10 is at a
standstill during a time when the~auxiliary functions of the
ve~hicle are being utilized, engine speed need only be
operated between the idle and the reference point as shown
in Figure 3 instead of the higher setting at which present
prior art systems are operated. This operation results in
an eficient and economical utilization of engine output.
.
'
.

Dessin représentatif

Désolé, le dessin représentatif concernant le document de brevet no 1164973 est introuvable.

États administratifs

2024-08-01 : Dans le cadre de la transition vers les Brevets de nouvelle génération (BNG), la base de données sur les brevets canadiens (BDBC) contient désormais un Historique d'événement plus détaillé, qui reproduit le Journal des événements de notre nouvelle solution interne.

Veuillez noter que les événements débutant par « Inactive : » se réfèrent à des événements qui ne sont plus utilisés dans notre nouvelle solution interne.

Pour une meilleure compréhension de l'état de la demande ou brevet qui figure sur cette page, la rubrique Mise en garde , et les descriptions de Brevet , Historique d'événement , Taxes périodiques et Historique des paiements devraient être consultées.

Historique d'événement

Description Date
Inactive : CIB désactivée 2021-11-13
Inactive : CIB attribuée 2021-09-10
Inactive : CIB expirée 2010-01-01
Inactive : CIB de MCD 2006-03-11
Inactive : CIB de MCD 2006-03-11
Inactive : Périmé (brevet sous l'ancienne loi) date de péremption possible la plus tardive 2001-04-03
Accordé par délivrance 1984-04-03

Historique d'abandonnement

Il n'y a pas d'historique d'abandonnement

Titulaires au dossier

Les titulaires actuels et antérieures au dossier sont affichés en ordre alphabétique.

Titulaires actuels au dossier
S.O.
Titulaires antérieures au dossier
ROYAL R. HAWKINS
THOMAS R. FULKERSON
Les propriétaires antérieurs qui ne figurent pas dans la liste des « Propriétaires au dossier » apparaîtront dans d'autres documents au dossier.
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Description du
Document 
Date
(aaaa-mm-jj) 
Nombre de pages   Taille de l'image (Ko) 
Abrégé 1994-03-23 1 22
Revendications 1994-03-23 4 126
Dessins 1994-03-23 1 30
Description 1994-03-23 6 229